QuickBooks H202 error multi-user occurs when a multi-user mode is unable to establish a connection with the company file hosted on another computer. It typically indicates network issues preventing QuickBooks from accessing the company file. This error may arise for various reasons, such as incorrect network configuration, firewall settings blocking communication, or issues with the QuickBooks Database Server Manager. QuickBooks displays an error message stating "H202: QuickBooks Error – Multi-User Switching" when encountering this issue. Resolving the H202 error involves troubleshooting steps like verifying hosting settings, configuring firewall exceptions, ensuring network connectivity, and running QuickBooks File Doctor to diagnose and repair network-related problems.